Patents by Inventor Violete L. Stevens

Violete L. Stevens has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 4347194
    Abstract: Polyhydroxyl polyether compounds containing at least one monomeric unit each of the formulae: ##STR1## are disclosed. Polymeric condensation resins are prepared by allowing the polyhydroxyl polyethers to react with polyfunctional chain-forming compounds containing functional groups reactive with the hydroxyl groups of polyhydroxyl polyethers. The polyhydroxyl polyether compounds enhance the flame-retardant properties of polymeric condensation resins such as polyurethanes.
    Type: Grant
    Filed: May 11, 1981
    Date of Patent: August 31, 1982
    Assignee: The Dow Chemical Co.
    Inventors: Sally P. Ginter, Chester E. Pawloski, Violete L. Stevens
  • Patent number: 4298709
    Abstract: Polyhydroxyl polyether compounds containing at least one monomeric unit each of the formulae: ##STR1## are disclosed. Polymeric condensation resins are prepared by allowing the polyhydroxyl polyethers to react with polyfunctional chain-forming compounds containing functional groups reactive with the hydroxyl groups of polyhydroxyl polyethers. The polyhydroxyl polyether compounds enhance the flame-retardant properties of polymeric condensation resins such as polyurethanes.
    Type: Grant
    Filed: June 25, 1980
    Date of Patent: November 3, 1981
    Assignee: The Dow Chemical Company
    Inventors: Sally P. Ginter, Chester E. Pawloski, Violete L. Stevens
  • Patent number: 4296220
    Abstract: A method for preparing vinyl ester resins comprises reacting mono-, di- or polyhydroxy functional phenols with a tertiary alkyl glycidyl ether in the presence of a catalyst, e.g., triphenyl phosphine, followed by dealkylating and esterifying the adduct with an olefinically unsaturated aliphatic acid, e.g., acrylic acid, in the presence of a strong acidic catalyst, e.g., p-toluene sulfonic acid.
    Type: Grant
    Filed: June 2, 1980
    Date of Patent: October 20, 1981
    Assignee: The Dow Chemical Company
    Inventors: Harold O. Seeburger, Ralph G. Beattie, Violete L. Stevens
  • Patent number: 4296227
    Abstract: Polyether resins of the formula XA.sub.m wherein A is of the formula ##STR1## and X, R, R' and R" are specified substituents are disclosed.
    Type: Grant
    Filed: January 31, 1980
    Date of Patent: October 20, 1981
    Assignee: The Dow Chemical Company
    Inventors: Harold O. Seeburger, George J. Atchison, Violete L. Stevens
  • Patent number: 4269727
    Abstract: Effective radiation curable flame retardant compositions include compounds of the formula: ##STR1## wherein A is hydrogen or methyl; A' is hydrogen, methyl, phenyl or halogen; n is 1 or 1.5 and when n is 1, B is hydrogen or methyl and when n is 1.5, B is hydrogen; Y is oxygen or sulfur; R and R' are hydrogen, methyl, chloromethyl or bromomethyl.
    Type: Grant
    Filed: October 5, 1979
    Date of Patent: May 26, 1981
    Assignee: The Dow Chemical Company
    Inventors: George J. Atchison, Gerald K. McEwen, Violete L. Stevens
  • Patent number: 4228108
    Abstract: Effective reactive flame retardants are novel compounds of the formula: ##STR1## wherein A is hydrogen or methyl; A' is hydrogen, methyl, phenyl or halogen; n is 1 or 1.5 and when n is 1, B is hydrogen or methyl and when n is 1.5, B is hydrogen; Y is oxygen or sulfur; R and R' are hydrogen, methyl, chloromethyl or bromomethyl.
    Type: Grant
    Filed: November 13, 1978
    Date of Patent: October 14, 1980
    Assignee: The Dow Chemical Company
    Inventors: George J. Atchison, Gerald K. McEwen, Violete L. Stevens
  • Patent number: 4124389
    Abstract: A negative-working, reversibly gelled composition is disclosed, suitable for use as the photocurable component in a blank for preparation of an article in relief, such as a printing plate. Uncured portions of the composition are removed with an aqueous solution following imagewise modulated exposure of such a blank to actinic radiation. The composition comprises a first organic polymer bearing per molecule, at least one ethylenically unsaturated group which is polymerizable by a free radical source; and a second organic polymer bearing per molecule, at least two Z groups, Z being a primary hydroxyl or mercapto group, with the proviso that when said first organic polymer bears at least two Z groups per molecule, said second organic polymer may be omitted; said Z groups being reacted by contact with a dialdehyde to produce the reversibly gelled composition.
    Type: Grant
    Filed: April 7, 1977
    Date of Patent: November 7, 1978
    Assignee: The Dow Chemical Company
    Inventors: Clayton W. Hoornstra, Violete L. Stevens
  • Patent number: 4092339
    Abstract: Homopolymers and copolymers of glycidyl esters are made by reacting the acids to be esterified with the corresponding polymer of tert.-alkyl glycidyl ether under substantially anhydrous conditions and in the presence of a strong acid catalyst, preferably a sulfonic acid. The reaction proceeds satisfactorily at about 100.degree.14 150.degree. C with displacement of the tert.-alkyl group by the acyl group of the acid and evolution of tert.-olefin. By use of the appropriate proportion of reactant acid and/or appropriate reaction time, any desired proportion of the glycidyl groups can be esterified.
    Type: Grant
    Filed: November 19, 1975
    Date of Patent: May 30, 1978
    Assignee: The Dow Chemical Company
    Inventors: Violete L. Stevens, Arthur R. Sexton, Frederick P. Corson
  • Patent number: 4086151
    Abstract: Linear copolymers of glycidol, glycidyl esters of unsaturated fatty acids and, optionally, alkylene oxides, are made by the reaction of an unsaturated fatty acid with a polymer or copolymer of tert.-butyl glycidyl ether in the presence of an acid catalyst. The products are polymerizable and copolymerizable with vinyl monomers and are useful as curable resins.
    Type: Grant
    Filed: June 30, 1977
    Date of Patent: April 25, 1978
    Assignee: The Dow Chemical Company
    Inventors: Violete L. Stevens, Arthur R. Sexton, Frederick P. Corson
  • Patent number: 4080161
    Abstract: Antistatic compositions for topical application to substrates, which comprise(a) a polymer of less than about 20,000 molecular weight consisting essentially of, in polymerized form, about 10 to 99 mole % alkylene oxide, of 2 to 4 carbon atoms, about 1 to 90 mole % glycidol and about 0 to 15 mole % of the glycidyl ester of a fatty acid of about 2 to 20 carbon atoms and about 0 to 15 mole % of the glycidyl monoester of a polycarboxylic acid,(b) a curing agent capable of cross-linking the polymer by reaction with the primary hydroxyl groups of the glycidol units, such as melamine-formaldehyde condensates, dialdehydes, polycarboxylic acids and their anhydrides, epoxy resins (polyepoxides), polyisocyanates, and the like and(c) a catalyst for the curing reaction, such as zinc fluoroborate, a sulfonic acid, phosphoric acid, ammonium sulfate or the like.
    Type: Grant
    Filed: April 20, 1976
    Date of Patent: March 21, 1978
    Assignee: The Dow Chemical Company
    Inventors: Violete L. Stevens, Arthur R. Sexton, James W. Lalk, Ronald D. Deibel, Fred P. Corson
  • Patent number: 4077991
    Abstract: New polymers are copolymers of glycidol, glycidyl esters of fatty acids, and, optionally, alkylene oxides. They are conveniently made by the reaction of a fatty acid with a polymer or copolymer of tert.-butyl glycidyl ether in the presence of an acid catalyst. They are useful as coatings, lubricants, plasticizers, textile antistatic agents and surfactants.
    Type: Grant
    Filed: November 19, 1975
    Date of Patent: March 7, 1978
    Assignee: The Dow Chemical Company
    Inventors: Violete L. Stevens, Arthur R. Sexton, Frederick P. Corson
  • Patent number: 4072529
    Abstract: A negative-working, reversibly gelled composition is disclosed, suitable for use as the photocurable component in a blank for preparation of an article in relief, such as a printing plate. Uncured portions of the composition are removed with an aqueous solution following imagewise modulated exposure of such a blank to actinic radiation. The composition comprises a first organic polymer bearing per molecule, at least one ethylenically unsaturated group which is polymerizable by a free radical source; and a second organic polymer bearing per molecule, at least two Z groups, Z being a primary hydroxyl or a mercapto group, with the proviso that when said first organic polymer bears at least two Z groups per molecule, said second organic polymer may be omitted; said Z groups being reacted by contact with a dialdehyde to produce the reversibly gelled composition.
    Type: Grant
    Filed: August 20, 1975
    Date of Patent: February 7, 1978
    Assignee: The Dow Chemical Company
    Inventors: Clayton W. Hoornstra, Violete L. Stevens
  • Patent number: 4014854
    Abstract: Linear copolymers of glycidol, glycidyl esters of unsaturated fatty acids and, optionally, alkylene oxides, are made by the reaction of an unsaturated fatty acid with a polymer or copolymer of tert.-butyl glycidyl ether in the presence of an acid catalyst. The products are polymerizable and copolymerizable with vinyl monomers and are useful as curable resins.
    Type: Grant
    Filed: February 20, 1974
    Date of Patent: March 29, 1977
    Assignee: The Dow Chemical Company
    Inventors: Violete L. Stevens, Arthur R. Sexton, Frederick P. Corson
  • Patent number: 4006068
    Abstract: Polymercaptocarboxylic esters of polyglycidols comprising units represented by the formula ##STR1## are disclosed as well as a method for utilizing the same to prepare cross-linked polymeric compositions.
    Type: Grant
    Filed: April 30, 1975
    Date of Patent: February 1, 1977
    Assignee: The Dow Chemical Company
    Inventor: Violete L. Stevens
  • Patent number: 4003961
    Abstract: Linear copolymers of glycidol, glycidyl esters of unsaturated fatty acids and, optionally, alkylene oxides, are made by the reaction of an unsaturated fatty acid with a polymer or copolymer of tert.-butyl glycidyl ether in the presence of an acid catalyst. The products are polymerizable and copolymerizable with vinyl monomers and are useful as curable resins.
    Type: Grant
    Filed: December 22, 1975
    Date of Patent: January 18, 1977
    Assignee: The Dow Chemical Company
    Inventors: Violete L. Stevens, Arthur R. Sexton, Frederick P. Corson